I like the banjo tuners on the nylon and that's the best use for the cutaway butt I've seen (ie. resting the guitar on your knee) for classical players...I have heard better sounding nylon electrics though. Not sure about that big arm just to support a strap lock and the tie bridge when they make ball end nylon strings...it is very nice and a very worthy project...

On the taproot, it is definitely beyond trees. The guy is an exceptional wood worker. Not sure how well redwood which is pretty darn soft will work as a neck, but this guy is beyond any second guessing on my part and knows his stuff. I think The Sgt Pepper band would have liked this concept...

There used to be a company that made guitar necks with interchangeable fingerboards; Tony Levin used to endorse 'em during the Three of a Perfect Pair/So period. Anyway, while trying and failing to find video/photos of said necks, I found this guy's work:

For me, it makes the guitar sound like a sitar. Good belly dancer concept guitar IMHO. His micro tones are what I would call subtle bends...He just needs a gypsy or belly dancer to go with the video...

ps. 8 strings in altered tuning with the melody played on one or two of them in a single mode, seems to be greatly enhanced when he starts tapping and playing many strings with both hands. Not sure if the guitar is in or out of tune as the micro tones are going to make some of that out of tune sound happen naturally. Cool concept...

He has another video with a bit of Floyd's "Wish You Were Here", but its clear that he's not a great player, and it's probable that the guitar is out of tune...And its just as dark as the other vid, so you really can't see much beyond the LEDs.

This design, along with the one that looks like a fish skeleton, though imaginative & spacey, seems like the worst possible ergonomics one could think of in building an instrument that humans have to play. There's no body to anchor solidly against the player's body for stability, so the fretting hand has to hold the thing up, & there's no mass to provide sustain, nothing solid to push against for bends & vibrato. I don't get it.

Here`s one, Dragonfly Guitars from Osaka. 26.2 inch scale length-I`ve played one they are a lot of fun:

Standard tuning, not baritone? That's long. Does it feel substantially longer than a Fender neck? I'll bet ease of playing upper frets is great, but wonder about certain 1st position chord voicings being more of a stretch.